The battery-free Mepro M22 reflex sight is powered by fiber-optic illumination by day and premium Swiss-processed tritium vials by night. The transition between the two systems is instantaneous. Its rugged, battle-proven construction meets or exceeds rigorous standards to function in the harshest environments. The Mepro MMX4 micro magnifier is a compact, light weight magnifier that will extend the effective range of your red dot or reflex sight. Weighing in 6.9 oz., it reduces the footprint, saving rail space and weight on your firearm.